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AT-TQ2403 Management Software User's Guide 275
802.11a Turbo
IEEE 802.11a Turbo is a proprietary variant of the 802.11a standard from Atheros Communications.
It
supports accelerated data rates ranging from 6 to 108Mbps. Atheros Turbo 5 GHz is IEEE 802.11a Turbo
mode. Atheros Turbo 2.4 GHz is IEEE 802.11g Turbo mode.
802.11b
IEEE 802.11b (IEEE Std. 802.11b-1999)
is an enhancement of the initial 802.11 PHY to include 5.5 Mbps and
11 Mbps data rates. It uses direct sequence spread spectrum (DSSS) or frequency hopping spread spectrum
(FHSS) in the 2.4 GHz ISM band as well as complementary code keying (CCK) to provide the higher data
rates. It supports data rates ranging from 1 to 11 Mbps.
802.11d
IEEE 802.11d defines standard rules for the operation of IEEE 802.11 wireless LANs in any country without
reconfiguration. PHY requirements such as provides frequency hopping tables, acceptable channels, and
power levels for each country are provided. Enabling support for IEEE 802.11d on the access point causes
the AP to broadcast which country it is operating in as a part of its beacons. Client stations then use this
information. This is particularly important for AP operation in the 5GHz IEEE 802.11a bands because use of
these frequencies varies a great deal from one country to another.
802.11e
IEEE 802.11e is a developing IEEE standard for MAC enhancements to support QoS. It provides a mechanism
to prioritize traffic within 802.11. It defines allowed changes in the Arbitration Interframe Space, a minimum
and maximum Contention Window size, and the maximum length (in kµsec) of a burst of data.
IEEE 802.11e is still a draft IEEE standard (most recent version is D5.0, July 2003). A currently available
subset of 802.11e is the Wireless Multimedia Enhancements (WMM) standard.
802.11f
IEEE 802.11f (IEEE Std. 802.11f-2003) is a standard that defines the inter access point protocol (IAPP) for
access points (wireless hubs) in an extended service set (ESS). The standard defines how access points
communicate the associations and reassociations of their mobile stations.
802.11g
IEEE 802.11g (IEEE Std. 802.11g-2003) is a higher speed extension (up to 54 Mbps) to the 802.11b PHY,
while operating in the 2.4 GHz band. It uses orthogonal frequency division multiplexing (OFDM). It supports
data rates ranging from 1 to 54 Mbps.
802.11h
IEEE 802.11h is a standard used is to resolve the issue of interference which was prevalent in 802.11a. The
two schemes used to minimize interference in 802.11h are Transmit Power Control (TPC) and Dynamic
Frequency Selection (DFS). DFS detects other APs on the same frequency and redirects these to another
channel. TCP reduces the network frequency output power of the AP, thus reducing the chance of any
interference. This is a required standard in Europe, Japan, and the U.S.